GB2046987A - Metal vapour discharge lamp - Google Patents
Metal vapour discharge lamp Download PDFInfo
- Publication number
- GB2046987A GB2046987A GB8010608A GB8010608A GB2046987A GB 2046987 A GB2046987 A GB 2046987A GB 8010608 A GB8010608 A GB 8010608A GB 8010608 A GB8010608 A GB 8010608A GB 2046987 A GB2046987 A GB 2046987A
- Authority
- GB
- United Kingdom
- Prior art keywords
- switch means
- heat sensitive
- discharge lamp
- sensitive switch
- metal vapor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910052751 metal Inorganic materials 0.000 title claims description 44
- 239000002184 metal Substances 0.000 title claims description 44
- 230000008018 melting Effects 0.000 claims description 11
- 238000002844 melting Methods 0.000 claims description 11
- 239000011888 foil Substances 0.000 claims description 5
- 230000003111 delayed effect Effects 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 2
- 229910052734 helium Inorganic materials 0.000 claims description 2
- 229910052743 krypton Inorganic materials 0.000 claims description 2
- 229910052754 neon Inorganic materials 0.000 claims description 2
- 229910052724 xenon Inorganic materials 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 1
- 208000028659 discharge Diseases 0.000 description 87
- 229910001507 metal halide Inorganic materials 0.000 description 18
- 150000005309 metal halides Chemical class 0.000 description 18
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 16
- 239000007789 gas Substances 0.000 description 12
- 238000013021 overheating Methods 0.000 description 11
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 10
- 229910052759 nickel Inorganic materials 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 229910052753 mercury Inorganic materials 0.000 description 5
- 239000011521 glass Substances 0.000 description 4
- 239000011324 bead Substances 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- JXBFBSYDINUVRE-UHFFFAOYSA-N [Ne].[Ar] Chemical compound [Ne].[Ar] JXBFBSYDINUVRE-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- SLSBUGNNRDXZJZ-UHFFFAOYSA-N krypton neon Chemical compound [Ne].[Kr] SLSBUGNNRDXZJZ-UHFFFAOYSA-N 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229920000136 polysorbate Polymers 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/54—Igniting arrangements, e.g. promoting ionisation for starting
- H01J61/541—Igniting arrangements, e.g. promoting ionisation for starting using a bimetal switch
- H01J61/542—Igniting arrangements, e.g. promoting ionisation for starting using a bimetal switch and an auxiliary electrode inside the vessel
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
- Discharge Lamps And Accessories Thereof (AREA)
Description
(12)UK Patent Application (,,GB 2 046 987 A (21) Application No 8010608
(22) Date of filing 28 Mar 1980 (30) Priority data (31) 541036552 541037880 541037881 (32) 28 Mar 1979 30 Mar 1979 30 Mar 1979 (33) Japan(JP) (43) Application published Page 4, fine 51 for bulk read bulb line Q THE PATENT OFFICE 31 December 1981 (54) Metal vapor discharge lamp (57) A metal vapor discharge lamp comprises main electrodes 3a, 3b and an auxiliary electrode 10 in an arc tube 2 to initiate a discharge between the main electrode and the auxiliary electrode and hence to initiate a discharge between the main electrodes upon disconnection of the auxiliary electrode 10 by - 1---+ --4he- -tatt-h i o st himptallir ERRATA
SPECIFICATION NO 2046987A
1115b i,- ---.., G) W bli C) 4:5 a) (D 00 --j 1 GB 2 046 987 A 1 SPECIFICATION
Metal vapor discharge lamp The present invention relates to metal vapor discharge lamps such as high pressure mercury vapor discharge lamps filled with mercury and a rare gas, high pressure sodium vapor discharge lamps filled with mercury, a rare gas and sodium and metal halide vapor discharge lamps filled with mercury, a rare gas and a metal halide, More particularly, it relates to metal vapor discharge lamps which are started by the operation of a heat sensitive switch means such as a bimetallic switch, which lamps have the advantage of preventing ballast from overheating to cause a fused bond between the contacts of the bimetalic switch.
A metal halide lamp will be described with reference to accompanying drawings as a typical exam- ple of a conventional vapour discharge lamp.
The metal halide lamp contains mercury, a rare gas and a metal halide as a discharge-sustaining filler and has superior efficiency and color rendering property to those of a high pressure mercury vapor discharge lamp.
Figure 1 of the drawings shows the structure of a metal halide discharge lamp which can be operated on a conventional ballast as used for a high pressure mercury vapor lamp.
An outer bulb made of a light transmissable hard glass (1) covers an arc tube (2) made of a transparent quartz glass and filled with a rare gas such as neon-argon or neon-krypton and a desired quantity of mercury and a metal halide.
Main electrodes (3a), (3b) are placed at opposite ends of the arc tube (2) to face each other and are connected through metal foils (4a), (4b) made of molybdenum to leads (5a), (5b). The lead (5a) is connected through a filament (7), positioned to operate a bimetallic strip (6) as a heat sensitive switch means, to a stem lead (8a). The other lead (5b) is connected through a current feeding wire (9) made of tungsten or the like to the stem lead (8b).
An auxiliary electrode (10) is placed to face the adjacent main electrode (3a) and is connected through a metal foil (11) to a lead (12).
The lead (12) is connected to a fixed contact (14) placed on a glass bead (13) for holding bimetallic strip (6) and is further connected through a movable 50 contact (15) placed at one end of the bimetalic strip (6), the bimetallic strip itself and a fixed terminal (16) to the stem lead (8b). An outer coating (17) for increasing the densities of the metal halides in the arc tube (2) during its operation is placed atthe end 55 of the arc tube (2).
A Zr-Al type getter is placed in the outer bulb (1) which is filled with Ne-N2 mixed gas at a desired pressure to prevent Ne gas from permeating through the arc tube (2). A stem (19) and a base (20) 60 are provided.
When the metal halide discharge lamp having said structure is operated by connecting a power source through a ballast for a high pressure mercury vapor discharge lamp, an auxiliary discharge is initiated 65 between the main electrode (3a) and the auxiliary electrode (10) and then the bimetallic switch (6) is operated by the heat generated from the arc tube and the filament (7) after the continuation of the auxiliary discharge for a predetermined time where- by the connection between the fixed contact (14) and the movable contact 0 5) is broken. As in the arc tube (2), ionized gas is formed by the auxiliary discharge, and the main discharge is initiated easily when a surge voltage induced by the ballast is applied between the main electrodes (3a), (3b). However, the phenomenon of discharge between the fixed contact (14) and the movable contact (15) and between the fixed contact and the bimetallic strip (6) is found. In particular, after prolonged operation of the lamp, if the main discharge between the main electrodes (3a), (3b) is not stabilized afterthe disconnection of the bimetallic switch, discharge between the contacts (14), (15) may ocur repeatedly until the contacts are finally fuse-bonded to prevent the normal dis- charge between the main electrodes whereby a large current substantially equal-to a short-circuit current through-the ballast continuously flow between the main electrode (3ay and the auxiliary electrode (10) to cause overheating of the ballast.
The present invention provides a metal vapor discharge lamp comprising an arc tube in an outer bulb and first heat sensitive switch means in the outer bulb to initiate a discharge in the arc tube, one or more said first heat sensitive switch means being connected in series to one or more second heat sensitive switch means having delayed operation relative to the operation of said first heat sensitive switch means, whereby when said first heat sensitive switch means becomes inoperative a circuit formed in said outer bulb which the first switch means has failed is broken by a discharge taken place between parts of said circuit liaving different potentials in said outer bulb when said second heat sensitive switch means is operated, In the metal vapor discharge lamp having said structure, at least one of the parts having different potential's has an easily dischargeable configuration so as to prevent easily overheating of the ballast.
In the metal vapor discharge lamp having said structure, a low melting metal is connected at the discharge part or nearthe discharge part so as to prevent easily overheating of the ballast.
Preferred embodiments of the present invention will now be clecribed with reference to the accom- panying drawings wherein:
Figure 1 is a front view of a conventional metal vapor discharge lamp; Figures Z 3 and4 are respectively circuit diagrams of three embodiments of metal vapor discharge lamps in accordance with the present invention; Figure 5 is a front view of one embodiment of a metal vapor discharge lamp in accord'ance with the present invention; and Figures 6 and 7 respectively designate front view of two other embodiments of metal vapor discharge lamps of the present invention.
Figure 2 of the drawings is a circuit diagram of a metal vapor discharge lamp in accordance with the present invention. A pair of main electrodes (3a), (3b) are sealed at opposite ends of the arc tube (2) 2 GB 2 046 987 A 2 and the auxiliary electrode (10) is positioned to face at least one of the adjacent main electrodes (3a). The main electrode (3a) is connected through a heater (7) for the heat sensitive switch means to the secondary terminal (23) of the ballast (22). The auxiliary elec I trode (10) is connected through second heat sensi tive switch means (6b) and first heat sensitive switch means (6a) to the secondary terminal (24) of the ballast (22) and the main electrode (3b) is connected directly to the secondary terminal (24) without connection through the heat sensitive switch means (6b), (6a). The second heat sensitive switch means (6b) is set for delayed operation relative to the first heat sensitive switch means (6b). when a power source is supplied through the ballast (22) in such a circuit as shown in said circuit diagram, an auxiliary discharge is set up between the main electrode (3a) and the auxiliary electrode (10) and then the first heat sensitive switch means (6a) is operated after a predetermined time, to open the connection of the first comprising secondary terminal (23) of ballast (22)-heater M-main electrode (3a)-auxiliary elec trode 0 0)-second heat sensitive switch means (6b) and the circuit of first heat sensitive switch means (6a)-secondary terminal of ballast (22) to initiate the main discharge between the main electrodes (3a), (3b). Thereafter, the second heat sensitive switch means (6b) is operated to open the connection between the second heat sensitive switch means (6b) and the auxiliary electride (10).
The connection of the second heat sensitive switch means (6b)-the second terminal (24) is opened by the operation of the first heat sensitive switch means (6a) whereby the operation of the second heat sensitive switch means has no electrical effects 100 under normal circumstances. When a power source is supplied through the ballast (22) with the first heat sensitive switch means (6a) fuse bonded, a dis charge takes place between the connecting part (A) which connects the first heat sensitive switch means (6a) with the second heat sensitive switch means (6b) and the connection between the main electrode (3a) and secondary terminal (23) of the ballast after the operation of the second heat sensitive switch means (6b) since the connection of the first heat sensitive switch means (6a) with the second heat sensitive switch means (6b) is not opened, because of the fused bonding of the first heat sensitive switch means (6a), even afterthe predetermine time forthe discharge between the auxiliary electrode (10) and the adjacent main electrode (3a). The discharge results in the disconnection of at least one pair of parts having different potentials to prevent the large current-flow whereby the overheating of the ballast (22) can be prevented. The disconnection can be realized in or near the discharge part.
Figure 3 is a circuit diagram of a second metal vapor discharge lamp in accordance with the present invention.
When the power source is supplied through the ballast (22) under normal conditions, a closed circuit comprising secondary terminal (23) of ballast-first heat sensitive switch means (6a)-second heat sensi tive switch means (6b)-heater (7)-current limiting resistor (25)-secondary terminal (24) of ballast is formed. In the closed circuit, a current flows which is dependent mainly upon the resistance of the current limiting resistor (25). When the first heat sensitive switch means open after a predetermined time, a surge voltage induced by the ballast is applied between the main electrodes (3a), (3b) and the glow discharge is struck between the auxiliary electrode (10) connected to the resistor (26) and the main electrode (3a) whereby the main discharge between the main electrodes (3a), (3b) can be easily initiated. When the first heat sensitive switch means come into fused contact underthe condition of the small resistance of the current limitting resistor (25) or short circuit of the current limitting resistor (25), the overheating of the ballast can not be prevented in the conventional metal vapor discharge lamp without the second heat sensitive switch means.
But, in accordance with the metal vapor discharge lamp of the present invention, the discharge is struck between the joint (A), which connects the first heat sensitive switch means (6a) and the second heat sensitive switch means (6b), and a part of the circuit connected to the secondary terminal (24) of the ballast whereby at least one of the part of the closed circuit is disconnected to prevent the over-heating of the ballast.
Figure 4 is the other circuit diagram of the metal vapor discharge lamp of the present invention. When the power source is supplied through the ballast (22) under the normal circumstances, a closed circuit of secondary terminal (23) of ballastfirst heat sensitive switch means (6a)- second heat sensitive switch means (6b)-current limitting resistor (25)secondary terminal (24) of ballast is formed. In the closed circuit, a currentflows corresponding to the resistance of the current limitting resistor (25) and the inductance of the ballast (22) and a surge voltage is applied between the main electrodes (3a), (3b) by the operation of the first heat sensitive means (6a) after a predetermined period, to operate the main discharge between the main electrodes (3a), (3b). When the first heat sensitive switch means come into fused-contact under the condition of the small resistance of the current limitting resistor (25) or shortcircuit of the current limitting resistor (25), the overheating of the ballast can not be prevented in the conventional metal vapor discharge lamp without the second heat sensitive switch means.
But, in accordance with the metal vapor discharge lamp of the present invention, the discharge is struck between the joint (A), which connects the first heat sensitive switch means (6a) and the second heat sensitive switch means (6b), and a part of the circuit connected to the secondary terminal (24) of the ballast whereby at least one of the part of the closed circuit is disconnected to prevent the overheating of the ballast.
The embodiment of the metal vapor discharge lamp of the present invention will be illustrated.
Figure 5 shows one embodiment of the metal halide discharge lamp of the present invention. The lead (12) connected through the metal foil (11) to the auxiliary electrode (10) is welded on a fixed joint rod (14) connected to the glass bead (13). The movable contact (15) formed atone end of the bimetal (6b) as il 3 GB 2 046 987 A 3 the heat sensitive switch means is brought into contact with the fixed joint rod (14). The other end of the bimetal (6b) is welded on the other fixed joint rod (16) connected to the glass bead (13). The fixed joint rod (16) is in series through the lead (21) with the movable contact (15') placed at one end of the bimetal (6a) as heat sensitive switch means, and is connected to the stem lead (8b).
The lead (21) is placed with a short gap to the filament (7) or the filament fixed rod (22). The bimetal (6b) as the second heat sensitive switch means is set so as to open the movable contact (15) from the fixed joint rod (14) after a period longer than the period for opening the bimetal (6a) as the first heat sensitive switch means. The other structure 80 is substantially the same as that of the conventional metal halide discharge lamp.
In the metal halide discharge lamp having said structure, when the power source is supplied through the ballast for the high pressure mercury vapor discharge lamp under the normal circumst ances, the auxiliary discharge is struck between the main electrode (3a) and the auxiliary electrode (10).
Afterthe continuation of the auxiliary discharge for a specific time, the bimetal (6a) as the first heat sensitive switch means is operated to disconnect the connection between the lead (21) and the movable contact (15') whereby the main discharge is struck between the main electrodes (3a), (3b). The contact of the movable contact (15) of the bimetal (6b) as the 95 second heat sensitive switch means with the fixed joint rod (14) is disconnected after forming the main discharge. When the movable contact 0 5') of the bimetal (6a) as the first heat sensitive switch means come into a fused bond with the lead (21), and the contact of the movable contact (15) with the fixed joint stem (14) is disconnected, a discharge is struck between parts having different potential such as between the lead (21) and the filament (7) or between the lead (21) and the filament fixed rod (22) 105 whereby the lead (21), the filament (2), the bimetal (6b) as the second heat sensitive switch means or the filament fixed rod (22) or (5a) is cut caused by a fusion and the current is cut off to prevent the overheating of the ballast.
In the metal vapor discharge lamp shown in Figure 5, the first heat sensitive switch means (6a) should be connected through the second heat sensitive switch means (6b) to the auxiliary electrode (10) through at leastthe second heat sensitive switch means (6b). The two kinds of the auxiliary heat sensitive switch means can be respectively each one, but high reliability is attained by using two or more means for each of the first and second heat sensitive switch means.
The prolonged life of the metal vapor discharge lamp can be maintained by forming the first heat sensitive switch means (6a) with a plurality of the heat sensitive switch means. When the operations times of the plurality of the first heat sensitive switch means are set slightly shifted, even though the discharge is repeated between the contacts of one of the plurality of the first heat sensitive switch means under the condition of preventing the main dis charge between the main electrode (3a), (3b) by an increase of the operation voltage of the arc tube or a deterioration of the heat sensitive switch means in its life, the main discharge can be struck without failure by the operation of the other heat sensitive switch means. It is preferable to set a gap in a range of 0.5 to 50 mm between the parts having different potentiais for the discharge. When it is less than 0.5 mm, the parts having different potentials may come into a fused bond by the discharge whereas when it is more than 50 mm, it is difficult to form the discharge between the predetermined parts.
When the gas filled in the outer bulb is at least one of the gas selected from the group consisting of He, Ne, Ar, Kr, Xe and N2, there is the effect for resulting in the discharge without failure and also for preventing a deterioration of substrates of in the outer bulb. The gas is preferably filled in the outer bulb under a pessure of less than 2 atm. When it is higherthan 2 atm., if is difficultto form the discharge between the predetermined parts.
When the gas is notfilled in the outer bulb to maintain a vacuum degree to less than 10-1 Torr, the effect of the invention can be imparted.
The eff ect of the present invention can be im- parted in the other discharge lamp for initiating the discharge by the operation of the heat sensitive switch means even through the circuit diagram is differentfrom those of the embodiments shown in the drawings.
Figure &shows the other embodiment of the metal halide discharge lamp of the present invention.
The projected lead (23) is formed on the lead (21). The safety lead (23) is placed with a quite short gap to the filament (7) or the filament fixed rod (22). The bimetal (6b) as the second heat sensitive switch means is set so as to disconnect the movable contact (15) from the fixed joint rod (14) after a period longer than that of the bimetal (6a) of the first heat sensitive switch means. The other structure is substantially the same as that of the metal halide discharge lamp shown in Figure 5.
In accordance with the metal halide discharge lamp having said structure, the safety lead (23) is formed on the lead (21) whereby the distance of the safety lead to the part having different potential such as the filament (7), the filament fixed rod (22) or (5a) can be set to a predetermined distance. Thus, the discharge can be securely formed to prevent the overheating of the ballast.
At least one of the parts having different potentials preferably has such a configuration for easy discharge as a needle, plate, foil or coil, whether the safety lead (23) is utilized or not. When it has such configuration, the discharge is easily formed be- tween the parts having different potentials when the second-heat sensitive switch means is operated under the condition of the fused bond of the first heat sensitive switch means. Moreover, the fused break of the easily dischargeable configuration parts can be easily resulted by the heat generated by the discharge in speedy.
Figure 7 shows the other embodiment of the metal halide discharge lamp of the present invention. Nickel sleeves (24) made of a low melting metal are formed at both ends of the filament (7) and the lead 4 GB 2 046 987 A 4 (21) and the filament (7) or the filament fixed rod (22) are placed with a quite short gap and the bimetal (6b) as the second heat sensitive switch means is set so as to open the movable contact (15) from the fixed joint rod (14) after a period longer than that of the bimetal (6a) as the first heat sensitive switch means.
The other structure is substantially the same as.that of the metal halide discharge lamp shown in Figure 5.
In accordance with the metal halide discharge lamp having said structure, the nickel sleeves (24) made of lower melting metal are formed at both ends of the filament (7) whereby the fused break of the nickel sleeve (24) is resulted by the heat gener- ated by the discharge and the current to the main electrode (3a) is stopped to prevent the burning of the ballast. The filament (7) can be connected through the nickel sleeve (24) to the filament fixed rod (22) or can be also connected directly to the fixed rod (22) by welding the nickel sleeve (24) on the filament (7). In the latter case, the fused break of the filament (7) or the fixed stem (22) is resulted by the heat generated by the melting of the nickel sleeve. The same effect can be expected by using a metal having a melting point of 400 to 25000C instead of the nickel sleeve (24). When it has a melting point of lower than 400'C, the disconnection may happen during the operation of the lamp to give a short life whereas when it has a melting point of higher than 2500'C, the said effect is not satisfactory.
When a part or whole of the lead (21) is made of a low melting metal such as nickel, the fused break of the circuit can be resulted by the discharge without failure.
Claims (11)
1. A metal vapor discharge lamp comprising an arc tube in an outer bulb and first heat sensitive switch means in the outer bulb to initiate a discharge in the arc tube, one or more said first heat sensitive switch means being connected in series to one or more second heat sensitive switch means having delayed operation relative to the operation of said first heat sensitive switch means, whereby when said first heat sensitive switch means becomes inoperative a circuit formed in said outer bulb which the first switch means has failed is broken by a discharge taken place between parts of said circuit having different potentials in said outer bulk when said second heat sensitive switch means is operated.
2. A metal vapor discharge lamp according to claim 1 wherein a gap of 0.5 to 50 mm is provided between said parts having different potentials for the said discharge in the outer bulk to take place.
3. A metal vapor discharge lamp according to claim 1 or claim 2 wherein the gas pressure in said outer tube is lower than 2 atm.
4. A metal vapor discharge lamp according to any preceding claim, wherein the outer bulb is filled with at least one gas selected from He, Ne, Ar, Kr, Xe and N2.
5. A metal vapor discharge lamp according to any preceding claim, wherein at least one of said first and second heat sensitive switch means is formed by a plurality of switches.
6. A metal vapor discharge lamp according to any preceding claim, wherein at least one of the parts between which said discharge takes place has an easily dischargeable configuration.
7. A metal vapor discharge lamp according to claim 6 wherein at least one of said parts between which said discharge takes place has a projection, needle, plate, foil, ribbon or coil configuration.
8. A metal vapor discharge lamp according to claim 7 wherein at least one of said parts between which said discharge takes place has a projection configuration projected toward the other said part.
9. A metal vapor discharge lamp according to any preceding claim, wherein a low melting point metal is connected at or near said discharge part.
10. A metal vapor discharge lamp according to claim 9, wherein said low melting point metal is a material having a melting point of 400to 2500'C.
11.
11. A metal vapor discharge lamp substantially as herein described with reference to any of Figures 2 to 7 of the accompanying drawings.
Printed for Her Majesty's Stationery Office by Croydon Printing Company Limited, Croydon Surrey, 1980. Published by the Patent Office, 25 Southampton Buildings. London, WC2A lAY, from which copies may be obtained.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3655279A JPS6032948B2 (en) | 1979-03-28 | 1979-03-28 | metal vapor discharge lamp |
| JP3788079A JPS6034218B2 (en) | 1979-03-30 | 1979-03-30 | metal vapor discharge lamp |
| JP3788179A JPS6034219B2 (en) | 1979-03-30 | 1979-03-30 | metal vapor discharge lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2046987A true GB2046987A (en) | 1980-11-19 |
| GB2046987B GB2046987B (en) | 1983-01-26 |
Family
ID=27289134
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8010608A Expired GB2046987B (en) | 1979-03-28 | 1980-03-28 | Metal vapour discharge lamp |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4345186A (en) |
| DE (1) | DE3011930C2 (en) |
| GB (1) | GB2046987B (en) |
| NL (1) | NL189888C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57152661A (en) * | 1981-03-16 | 1982-09-21 | Toshiba Corp | High pressure sodium lamp |
| US4465954A (en) * | 1982-05-10 | 1984-08-14 | Gte Products Corporation | Discharge lamp starting and operating circuit |
| JPH0622110B2 (en) * | 1984-02-14 | 1994-03-23 | 株式会社日立製作所 | Discharge lamp |
| US4695768A (en) * | 1985-12-19 | 1987-09-22 | General Electric Company | Bimetal switch for electrode heat cutout within an electrically insulating support |
| DE10081618B8 (en) * | 1999-05-28 | 2007-05-10 | Matsushita Electric Industrial Co., Ltd., Kadoma | Metal halide high-pressure discharge lamp |
| US6462478B1 (en) * | 2001-08-10 | 2002-10-08 | Osram Sylvania Inc. | Safety switch for lamp including a light source capsule |
| DE102006033871A1 (en) * | 2006-07-21 | 2008-01-24 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Discharge lamp with Zündhilfselement |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE945102C (en) * | 1940-07-21 | 1956-06-28 | Patra Patent Treuhand | Ignition and operating device for electric discharge tubes |
| US2329626A (en) * | 1940-09-13 | 1943-09-14 | Gen Electric | Electric discharge lamp |
| GB571072A (en) * | 1943-10-27 | 1945-08-03 | Herbert William Denton Ingham | Improvements in high pressure discharge tubes |
| US2497542A (en) * | 1947-06-27 | 1950-02-14 | Gen Electric | Time delay magnetic starter |
| US2464704A (en) * | 1947-07-12 | 1949-03-15 | Wade B Martin | Current control circuit |
| US2748315A (en) * | 1950-07-14 | 1956-05-29 | Wade B Martin | Current control circuit |
| FR1467050A (en) * | 1965-09-23 | 1967-01-27 | Lampes Sa | Ignition device for electric discharge lamps, in particular metal halide lamps |
| DE2052060A1 (en) * | 1969-10-27 | 1971-05-06 | Sylvania Electric Prod | Electric high pressure discharge lamp |
| US3746914A (en) * | 1971-12-30 | 1973-07-17 | Gte Sylvania Inc | Arc discharge tube with surrounding starting coil |
| US3965387A (en) * | 1974-06-24 | 1976-06-22 | General Electric Company | Electric lamp and thermal switch therefore |
| NL7809055A (en) * | 1978-09-05 | 1980-03-07 | Philips Nv | GAS AND / OR VAPOR DISCHARGE LAMP. |
| US4258288A (en) * | 1979-05-09 | 1981-03-24 | Westinghouse Electric Corp. | Resistor-aided starting of metal halide lamps |
-
1980
- 1980-03-06 NL NLAANVRAGE8001339,A patent/NL189888C/en not_active IP Right Cessation
- 1980-03-14 US US06/130,238 patent/US4345186A/en not_active Expired - Lifetime
- 1980-03-27 DE DE3011930A patent/DE3011930C2/en not_active Expired
- 1980-03-28 GB GB8010608A patent/GB2046987B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE3011930C2 (en) | 1985-07-25 |
| NL189888C (en) | 1993-08-16 |
| DE3011930A1 (en) | 1980-10-02 |
| NL8001339A (en) | 1980-09-30 |
| GB2046987B (en) | 1983-01-26 |
| US4345186A (en) | 1982-08-17 |
| NL189888B (en) | 1993-03-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 711A | Proceeding under section 117(1) patents act 1977 | ||
| 746 | Register noted 'licences of right' (sect. 46/1977) |
Effective date: 19960611 |
|
| PE20 | Patent expired after termination of 20 years |
Effective date: 20000327 |